1 named cultivar

‘Potimarron’Potimarron Squash

fruit vegetable

Squash

The Story

Plant Bio

Cucurbita maxima is the squash species behind hubbard, buttercup, kabocha and the giant pumpkins, a trailing warm-season annual from South America. Large rough prickly leaves with palmate veining rise from running stems, funnel-shaped yellow flowers three to six inches across open in summer, and the fruit stalk is round and corky rather than ridged.

This is the species behind every record-breaking giant pumpkin, and the soft round stalk is what distinguishes it from the hard ridged stem of Cucurbita pepo. Its fruit generally stores longer and tastes sweeter than pepo squashes, which is why kabocha and buttercup types belong here. Vines run ten feet or more, so it needs real ground.

Uses & Benefits:

Bold foliage and large yellow flowers, with fruit that is decorative in its own right.

The best-storing and often sweetest of the squashes, and the species behind giant pumpkins.

Squash bees and bumblebees work the flowers heavily in the early morning.

Essentials

At a Glance

Plant Type

Fruit Vegetable

Height

24 inches

Width

180 inches

Light

Full Sun

Zones

4, 5, 6, 7, 8, 9, 10

Water

Moderate to high

Humidity

Moderate

Lifespan

Annual

Native To

South America

Toxicity

Edible; discard any bitter fruit

Planting

How to Grow

Sow after all frost into thoroughly warm soil.
Give it full sun and rich, freely draining ground.
Allow ten feet or more of run per plant.
Water deeply and evenly while fruit swells.
Leave a few inches of stalk when cutting fruit.
Cure winter squash warm for a week before storing.

Pro Tip

Cut the fruit with a few inches of stalk attached — a squash snapped off at the shoulder rots within weeks instead of storing.

Keep It Thriving

Care Guide

Do

Give each plant ten feet of run 📏
Water deeply while fruit swells 💧
Leave a stalk on cut fruit 🎃
Cure winter squash before storing 🌡️

Don't

Sow into cold soil ❌
Snap fruit off at the shoulder ❌
Store uncured squash ❌

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Harvest
Sow

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Productive vegetable plot with space to runTrailing over a bank or rough groundGiant pumpkin growing

Companion Plants

Sweet Corn Pole Bean Nasturtium Borage Marigold

Multiply

Propagation Methods

Good to Know

Common Questions

Squash questions

What zones can Squash grow in?

Squash is hardy in USDA Zones 4–10. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Squash deer resistant?

Not reliably. Deer may browse Squash, especially tender spring growth — plan on repellents or fencing where pressure is high.

When does Squash bloom?

Squash typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Squash need full sun?

Squash does best in full sun (6+ hours).